13687687 has 4 divisors (see below), whose sum is σ = 14740600. Its totient is φ = 12634776.

The previous prime is 13687649. The next prime is 13687693. The reversal of 13687687 is 78678631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78678631 = 41 ⋅1918991.

It is a cyclic number.

It is not a de Polignac number, because 13687687 - 2¹⁵ = 13654919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13687627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526437 + ... + 526462.

It is an arithmetic number, because the mean of its divisors is an integer number (3685150).

Almost surely, 2^13687687 is an apocalyptic number.

13687687 is a deficient number, since it is larger than the sum of its proper divisors (1052913).

13687687 is a wasteful number, since it uses less digits than its factorization.

13687687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052912.

The product of its digits is 338688, while the sum is 46.

The square root of 13687687 is about 3699.6874192288. The cubic root of 13687687 is about 239.2085444817.

The spelling of 13687687 in words is "thirteen million, six hundred eighty-seven thousand, six hundred eighty-seven".